Oh, now that's interesting. I'll look into it.
Update: Can not replicate. Please delete the game/denoising_shader
folder, then reinstall the mod. If that does not work, you may safely delete the demo_gui.rpy
file since that exists exclusively to help other modders and affect how the mod runs in any way. I honestly don't know exactly what gone wrong for that error to occur, since it's showing that there's a duplicate screen defined on line 1 and line 22, but line 1 on that file is empty (except for a code comment).